Photographic developing-tank.



L. H. JEFFRIBS.

PHOTOGRAPHIU DEVELOPING TANK.

APPLICATION FILED 1113.23, 1914.

1,1 08,581 Q Patented Aug. 25, 1914.

2 EKEETS-SHEET 1.

liiiiruassqss v my lznegs' hMwW THE NORRIS PETERS CO. PHOTO-LITHO.. WASHINGTON. D. C.

L. H JEFPRIES.

PHOTOGRAPHIG DEVELOPING TANK.

.APPLIGATION FILED mums, 1914.

1,108,581. Patented Aug. 25,1914.

2 SHEETS-SHEET 2.

5 CO, PHOTO-LITHO.. WASHINGTON. D C

un'r

LOUIS H. JEFFRIES, OF MINNEAPOLIS, lvIINNESQTA.

' PI-lO-TUGRAPHIC DEVELOPING-TANK.

Specification of Letters Patent.

Patented Aug. 25, 1914i.

Application filed February 28, 1914. Serial No. 821,826.

To all whom it may concern:

Be it known that l, Louis H. Jnrrurns, a citizen of the United States, residing at lviinneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Photographic Developing-Tanks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertainsto make and use the same.

hily invention has-for its object to provide an improved. photographic developing tank, and to such ends, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

The term developing, as herein used to describe the character of the tank is em ployed in a broad sense to include all of the tank operations carried out in the development of the films, such for instance, as the ordinary step of developing, fixing and washing of the films.

The main features of the invention are found in the employment of a circular or cylindrical tank in connection with an ap proximately round film supporting rack or wheel having radial arms, so that the films supported within the tank will. be evenly distributed and evenly spaced from the walls ofthe tank, and the tank will have no corners or angles adapted to contain unused developer or liquid. It has been found that in tanks having corners'or angles, old or decomposed particles of developing liquid will be lodged therein and will frequently damage a new supply of the developing liquid, and furthermore, it has been found that to produce an even development in all of the films, the films should be surrounded by and exposed to approximately the same amount of liquid. This can be easily accomplished only by the use of an, approximately cylindrical tank with an .approxi mately circular rack or whee]. having radial film supporting arms.

The invention is illustrated in the accompanying drawings, wherein like characters someparts being broken away and some parts being sectioned; Fig. 2 is a section taken approximately on the line a m on Fig. 1; Figs. 3 and d are sections taken on the line 00" on Fig. 1; Fig. 5 is a section taken on the line .11 on Fig. 1; Fig. 6 is a fragmentary section taken on the line a m on Fig. 5; Fig. 7 is a plan view showing one form of the approximately circular film holding rack or wheel having radial arms; Fig. 8 is a section taken on the line 00 m on Fig. 7; and Figs. 9, 10 and 11 are fragmentary views in perspective, showing modilied forms of the film holding rack.

In the construction illustrated, the bot toms of thetanks are formed from cylindrical tile sections 1 set into concrete bases 2,

the said concrete bases being preferably formed within metallic shells 3. ably, the interior-surfaces of the tile 1 is glazed, while the exterior surface thereof is left rough and unglased, so that it will form a better bond with the concrete bottom 2, said concrete bottom should, of course, be made of acid and water proof cement. Also, in construction illustrated, the tile 1, at its upper end, hasthe customary enlargement found in large drain tiles, and these enlargements afford convenient ledges l on which the film supporting rack or wheel may be sup mrted.

In Fig. l, I have shown a battery or series of tanks 1, located side by side, and pro- "ided with valve-eipiipped drain pipes l arranged to deliver into the connnon drain gutter The said pipes l are partly embedded in the concrete bottoms 2, and at the axis thereof, are provided with upturned end portions 4-", which, in certain instances, are internally threaded for engagement with the threaded lower end of a detachable drain pipe 6, as shown in Fig. 3. The detachable drain pipe 6, .at its intermediate portion, has water escape passages or per forations 7, for a purpose which will hereinafter appear. In other instances, overflow drain pipes 8, open at their upperends but having no intermediate openings, are screwed into the upper ends of the said drain pipes i, as best shown in Fig. 5. When the overflow pipe 8 is employed, its upper end should terminate at the proper distance below the top of the tank, to maintain the desired level of the liquid in the tank.

The purpose of the drain pipe 6 with perforations 7, is to drain the main body of the liquid from the tank leaving the precipitated Prefer silver compounds or other precipitate in the bottom of the tank below the perforations 7.

As best shown in Figs. 5 and 6, the numeral 9 indicates a water supply pipe eX- tending into the concrete base 2 and provided with upturned branches 9 that open into the bottom of the tank through funnel .shaped depressions 10 formed in the concrete bottom 2. The water supplypip-e 9 is shown as provided with an ordinary globe valve ll. Any one or more of the tanks, if desired, may be provided with a suitable coverl2.

The film holding rack or wheel shown in Figs. 1, 4, 5,. 6 and 8 comprises a sleeve-like hub 13, an annular rim l t and radial. arms or spokes 15. The rim 14-. is of such diameter that it will rest on the ledge 1 and support the films on the arms 15 thereof, as shown in Fig. t. The sleeve-like hub 13 projects above the rim and is provided with a diamjetrical rod 16 which affords a convenient hand piece located above the liquid of the tank.

The film holding rack shown in Fig. 9 is made up of an inner ring orhub 17, outer rim 18, connecting spokes 1.9, and radial. arm 90 and 21 supported respectively, by the said hub 17 and rim 18. The film holding rackshown in Fig. 10 comprises only an outer rim and inwardly extended radial. arms 2". T film holding racks shown in Fig. 11 comprise a sleeve-like hub 2d and outwardly extended radial arms 25. The outer ends of the arms 25 may be rested on the ledge 1 of the tank, or the said film supporting rack, or any other of the films there of, may be siiipported in the tank by any other suitable means.

The tanks shown in Fig. 1., counting from left toward the ri 'ht are ada ated to be used C 7 7 respectively, for developing, rinsing, washing and fixing. The so-called film holding rack or reels may, of course be used to support photographic plates or film pack holders. It will, of course, be understood that the purpose of glazing the inner surface of the tubular tile body of the'tank is to make the same impervious to water and acid proof, and also to close all of the pores and thereby prevent decomposed compounds from lodging therein.

What I claim is:

1. The combination with an approxh mately cylindrical photographic developing tank, of an approximately circular film holding rack having radial arms adapted to support and efficiently distribute films or plates Within said tank, the said tank, at its upper edge having a ledge adapted to engage and support said rack.

2. A photographic developing tank, comprising aconcretebase and a tubular tile having its lower end embedded in said concrete base.

A. photographic developing tank, comprising a concrete base and a tubular tile having its lower end embedded in said concrete base, the inner surface of said tile being glazed and the lower outer surface thereof being natural and unglaZed.

4-. A. photographic developing tank, comprising a concrete base and a tubular tile having its lO-WQI end embedded in said concrete base, and the said tubular tile having an expanded upper end afiording a ledge adapted to support a film holding rack.

5. A photographic developing tank, com-- prising a concrete oase anda tubular tile having its lower end embedded in said concrete base, and a metallic shell in which the concrete base of said tank is molded.

(3. A photographic developing tank comprising a concrete base and a tubular body set into said base, in combination with drain pipes and water supply pipes partly enr bedded in said concrete base and communicating with the interior of said tank.

7. The combination with a photograpl'iic developing tank having a drain pipe leading from the bottom thereof, of an inter mediately perforated supplemental drain pipe detachably securable to the inner end of said embedded drain pipe.

8. The combination with an approximately cylindrical photographic developing tank having a drain pipe extendingaxially upward fron'i its bottom terminating below the top thereof, of anapproximately circu lar film holder having radial arms and the central portion of which is adapted to clear and siurround the upper end of the said drain pipe, and means for supporting said film holder in said tank with its arms be. low the upper end of said drain pipe.

in testimony whereof'l atlix my signature in presence of two witnesses.

Louis n. Jnrrnins.

Witnesses: I

E. C. S'Ki'NKLu, HARRY D. KiLoonn.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents Washington, D. C. 

